Im curious why the ST classes dont follow IT classing a bit more. For instance, the ITS field is broke between STL and STU. However there is little chance a car meeting ITS classing would stand a chance in STU. Rich Walke's ITS RX7 turned STL car is nicely competitive on a national level, but if I wanted to do the same with my E30 BMW 325is which runs similar lap times to Rich's car, I can only run STU.

It looked like a great class at the Sprints this weekend, but after flipping through the rules I'm more confused.